Rub the ink to make it clear
Uses unique "FriXion Ink" that disappears when temperatures exceed a certain temperature.
Rub the brush marks with a special rubber, the ink color will be colorless and transparent due to the heat of friction.

No eraser marks when rubbed.
The ink is colorless using temperature changes, so it will not leave erasing.
The brush marks that enter the paper eyes can be erased cleanly, so there is almost no residue on it.

Write and erase anything.
Once erased, it can be rewritten over and over again.